Luca Marin (born 9 April 1986 in Vittoria, Province of Ragusa) is a former Italian medley swimmer.

He specialized in the 400 m medley, and won ten medals at European and World Championships in this event.

At the 2006 European Short Course Swimming Championships he won a gold medal, beating László Cseh, the world record holder.

He participated at the 2004 Summer Olympics at Athens for Italy, reaching 10th place in the 400 m medley.

[5] Marin represents the Knave (corresponding to the Jack in the Italian playing cards) within the communication code the duo formed by pro players Febo and Rico elaborated for their games since the mid-2000s during the Ossuccio Briscola Tournament.